The bush-meat trade has caused a serious of decline of this tropical, tree-dwelling monkey in both Ghana and Ctte d'Ivoire (Ivory Coast), a new report says.

This subspecies was named one of the 25 most endangered primates in an October 27, 2007, report by the Primate Specialist Group of the World Conservation Union's Species Survival Commission and the International Primatological Society, in collaboration with Conservation International.